Product Comparison: Protectants using the Si-Quat - 3-(trimethoxysilyl) propyldimethyloctadecyl ammonium chloride

Question? What is the difference between the different Si-Quat products that use the primary Active Ingredient 3-(trimethoxysilyl) propyldimethyloctadecyl ammonium?

Answer: The Silane Quaternary Ammonium Chloride Compound 3-(trimethoxysilyl) propyldimethyloctadecyl ammonium chloride, aka ‘Si-Quat’, was invented in the 1970s by DOW CORNING Chemical Company. The compound has been in use for over 40 years and has been proven to be safe and effective against a wide variety of microorganisms. Its unique structure allows the molecule to attach to almost any non-porous surface and fabrics and other types of textiles.

The Si-Quat molecule is licensed to manufacturers around the world and is commonly private labeled by dozens of companies. The chemistry of the products using the 3-(trimethoxysilyl) propyldimethyloctadecyl ammonium chloride compound, aka Si-Quat, is the same or very similar. The main variance in the active ingredient is typically the concentration level.

Below is a comparison chart of four popular Si-Quat products.


Silane Quaternary Ammonium Chloride (Si-Quat) Product Comparison Chart Active Ingredient Concentration Level (%)
 <<< Lowest to Highest >>>
ACTIVE INGREDIENT: RTU Surface Protectant Microbe-Shield 100 Protector
3-(trimethoxysilyl) propyldimethyloctadecyl ammonium chloride 0.50% 0.84% 1.00% 1.00%
Other Ingredients 99.50% 99.16% 99.00% 99.00%
Total Ingredients 100% 100% 100% 100%
Cost Per Gallon  $81.00 $75.00 $225.00 $70.00
Value Ranker (Concentration and Cost) LOW GREAT LOWEST BEST